I always really liked the Kowa spotting scopes over any other I ever used at a range, but they ain't cheap, especially not with the high end eyepiece. It isn't suitable for carrying around, too big, but awesome for the range. Best for a buddy spotting trace though, as you won't be seeing the holes like you say at that range, not unless it's a KD range with a pit crew marking hits.
What you can get to see holes at ranges even farther than 1000m, and it may sound silly but it'll work, is a small, cheap astronomy telescope w/ tripod. Maybe look on CL for a used one, even a decent child's version would be fine --you don't need the best optics to see the holes, and you sure as shit don't need the higher end magnifications or models. You may wanna look through a few, I couldn't tell you what magnification would be best for seeing bullet holes to a mile and under, but I can say it doesn't take much. I lost a white rocket as a kid in a strong gust and we had an idea where it went, so my dad pulled out our telescope (an old 60's or 70's Bushnell?) on the deck and we scanned the cotton fields over a mile out and it zoomed in real close, no different from standing there in front of it. I'd see no reason why you couldn't use that to see the hits. If you shoot from a bench or table usually, you'll like that the tripods generally are good for seated positions. You may have to make modifications if you want to use it in the prone. Be damn careful not to get sunlight focused through it.
But they have cheap wireless cameras now and all you need is a phone or laptop and that camera and you're good to go too. I'll probably go that route when I get my .50 provided I can find ones that will work to the range I need. If not or if they're too expensive, I'll go the telescope route as I know that'll work.
